STMicroelectronics ISO8200B

Overview

ISO8200B from STMicroelectronics is a galvanically isolated octal high-side smart power solid-state relay IC designed for industrial I/O control. It integrates eight independent high-side drivers with 0.12 Ω R_DS(on) (T_J = 25 °C), 0.7 A continuous output current per channel, 45 V V_CC rating, and 1370 V_PEAK isolation voltage - enabling safe switching of inductive, resistive, and capacitive loads referenced to ground in PLC and NC machine interfaces.

For engineers reviewing the ISO8200B datasheet, ISO8200B pinout, ISO8200B application, or ISO8200B equivalent, key selection considerations include its dual isolated voltage domains (V_CC/V_DD), synchronous/parallel interface timing (t_jitter(SCM) = 6 µs), thermal independence per channel, and integrated fault reporting via open-drain FAULT pin.

Technical Context

The ISO8200B implements two galvanically isolated voltage domains: V_CC (45 V max) powers the high-side power stage, while V_DD (3.3 V/5 V TTL/CMOS compatible) supplies the digital logic side. Its parallel interface supports both direct control mode (DCM) and synchronous control mode (SCM), with SCM enabling sub-6 µs inter-channel jitter and multi-device synchronized output updates.

Thermal protection operates at two levels: junction shutdown at 150–170 °C with 20 °C hysteresis, and case shutdown at 115–145 °C - both independently monitored per channel. Fault detection includes short-circuit current limiting (0.7–1.7 A), loss-of-GND/V_CC protection, undervoltage shutdown with hysteresis (0.35–0.5 V), and overvoltage clamping (45–52 V).

Key Specifications

Pinout & Package

ISO8200B is housed in PowerSO-36 package with exposed V_CC-connected tab for thermal dissipation. Pin layout features dual ground planes (GND_DD, GND_CC), 8 dedicated input pins (IN1–IN8), 16 output pins (dual-pinned OUT1–OUT8 for low-inductance routing), and dedicated control/monitoring pins including FAULT, OUT_EN, LOAD, and SYNC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side isolated driver applications.

Compared with IPS1021H and TPL7407L, ISO8200B uniquely delivers 8-channel galvanic isolation, parallel interface timing control, and integrated thermal/fault management in a single PowerSO-36 package - making it optimal for space-constrained, safety-critical PLC and NC I/O designs requiring deterministic behavior and field-side robustness.

Availability

ISO8200B is available at Aetrix Electronics and suitable for programmable logic controller output modules, industrial PC peripheral I/O cards, and numerical control machine tool interfaces requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-x EMC standards.

Supply support for ISO8200B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong emphasis on functional safety and reliability.

The ISO8200B belongs to ST's Smart Power Switch family, engineered specifically for industrial automation I/O modules where galvanic isolation, thermal resilience, and deterministic timing are mandatory design requirements.

FAQ

What is the maximum continuous output current per channel, and how is it limited?

The ISO8200B delivers 0.7 A continuous output current per channel, enforced by active current limiting that modulates gate voltage when sensed current exceeds 0.7–1.7 A threshold. This prevents destructive overcurrent while allowing brief peak currents up to 1.4 A before triggering hard shutdown - ensuring robust operation with inductive loads like solenoids and relays without external current-sense components.

How does the synchronous control mode (SCM) reduce output jitter compared to direct control mode (DCM)?

In SCM, the LOAD and SYNC signals are driven independently to decouple input latching from output update timing. This enables all 8 channels to change state simultaneously upon SYNC rising edge, achieving ≤6 µs inter-channel jitter - versus ~20 µs in DCM where each input directly controls its output with propagation delay variation. SCM is essential for multi-axis motion control synchronization.

Can the ISO8200B drive inductive loads without external flyback diodes?

Yes - the ISO8200B integrates a V_demag clamp that limits turn-off voltage to V_CC − 45 V (e.g., −21 V at 24 V V_CC). This internal clamp safely dissipates inductive energy during turn-off, eliminating the need for external freewheeling diodes in most 24 V industrial applications while maintaining fast demagnetization (<100 ns).

What fault conditions trigger the open-drain FAULT pin, and how is recovery handled?

The FAULT pin asserts low for junction overtemperature (>150–170 °C) or internal communication errors during data transfer across the isolation barrier. Recovery is automatic: once junction temperature falls below 150 °C reset threshold, the affected channel resumes operation; communication errors cause immediate output disable followed by re-enable upon next valid transmission - no manual reset required.